SQL语句 合并列值 将一列的多个值合并成一行

oralce写法:

select WM_CONCAT(A.title) as citys from tmpcity A

 

sql server写法:

select stuff((select ','+A.title from tmpCity A FOR xml PATH('')), 1, 1, '') as citys

 

MySQL写法:

select GROUP_CONCAT(A.title) as citys from tmpcity A;      --默认的逗号分隔
select GROUP_CONCAT(A.title SEPARATOR  ' ') as citys from tmpcity A;   --用空格分隔

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